Duplex trimming mechanism



Nov. 2, 1943. J. GALKIN DUPLEX TRIMMING MECHANI SM Filed Nov. 14, 1941 '6 Sheets-Sheet l JOSEPH GALKIN INVENTOR WWW ATTORNEY Nov. 2, 1943. J. GALKIN DUPLEX TRIMMING MECHANI SM Filed Nov. 14, 1941 e sheets-sheet 2 JOSEPH GALKlN INVENTOR. BY M ATTORNEY.

NOV. 2, 1943. GALKIN DUPLEX TRIMMING MECHANISM Filed Nov. 14, 1941 6 Sheets-Sheet 5 JOSEPH GAL'KIN INVENTOR ATTORNEY Nov. 2, 1943. J. GALKIN DUPLEX TRIMMING MECHANISM 6 Sheets-$heet 4 Filed Nov. 14, 1941 JOSEPH GALKIN JNVENTOR.

ATTORNEY.

NOV. 2, 1943. GALKlN DUPLEX TRIMMING MECHANISM Filed Nov. 14, 1941 6 Sheets-Sheet 5 JOSEPH GALKIN IN VENT OR ATT OHNE Y Nov. 2, 1943. GALKJN 2,333,421

DUPLEX TRIMMING MECHANISM Filed Nov. 14, 1941 6 Sheets-Sheet 6 12 Fig-13 JOSEPH GALKINY INVENTOR I BY W 3122M ATTO R N EY Patented Nov. 2, 1943 UNIT ED STA-TE S PAT-EN T OFFICE DUPLEX TRIMIMING MECHANISM.

Joseph Galkin, New York,. N.' YJ.

Application November 14, 1941; Serial No. 419,220:

2'Cl'aims.-

This. invention relates to improvements in: du-

plex trimming mechanism, and particularly to its application to sewing machines whereby beltloopsfor trousers are automatically produced in a single operation.

This application is-a continuation in part'of my copending abandoned application, Serial No. 374,923, filed 'Januaryl'l, 1941, for Duplex trimmingmechanism.

An object of this invention is "to provide -a com-- a duplex trimming mechanism comprising two fixed shear blades and two movable shear'blades, and to pivotally and-adjustably mount'the movable shear blades' so that point contact maybe had between the shear blades indefinitely.

With'the above and other'obiects-in view; the invention will be hereinafter more particularly;

described, and the combination and arrangement of parts will be shown in the accompanying drawingsand pointed out in the claims which form part of this specification.

Reference will now be had to, the drawings, wherein like numerals of reference designate corresponding parts throughout the several views, in which:

Figure 1 is a front elevation. ofasewing machine having my trimming mechanism applied.

thereto.

Figure 2 is an end view of thesewingmachine, partly in section.

Figure 3 is a top plan View, on .anenlargedscale, of a bracket on which the duplex trimming mechanism is mounted, the. work. supporting base being removed.

Figure 4 is a fragmentary plan, view showing, reciprocatory four-motion topfeed mechanism.

for feeding the fabric.

Figure 5 is a fragmentaryside view of .the'feeding mechanism shown in Figure4.

Figure 6 is an. end view ofthe duplex trimming mechanism,.looking in the direction of the vibratable connection.

(Cl. Mil-1715) Figure-'11s across-sectional view, the section being taken as v on line-l-l in Figure 3.-

Figure 8 is-a perspective view-of a setof stationarysheanblades.

Figu-re Q isa cross-sectionaliview of an "assembled top feed pressurebracket and plunger for resiliently downpressin'g the: top feed clogs.

Figure: 10- isaplan View: of a folder haVin-gsfi' n ger shieldsattached thereto.

Figure 1 1 is a fragmentary b'ottom view. of I amovabl'e blaziecarrier;

Figure=l 2 is an=end View o'f-a' modified: statiom ary shear bladeassembly having-two: individually adjustable disk -sliapedcuttingwheels:

Figure=l3 isa side view ofthe stationary shear. blade assembly shown in Figure 12.

Figure 14- is: an endiview of. l another modification ofshear blade assembly; rxartlybrokenv away to show two: disk-shaped cutting. wheels. which areadjusta-ble' as-a unitjointly withzan intermediate ali-ning disk Figure -lais aside viewv ofithe'twocutting.

whe els andthe alining disk shown. in; Figure 14:

Figure 16 i's-a side-view :oi-the shear bladeaassemblyshown-in Figure 14 3 In the-illustrated embodiment oi :th'e invention, the numeral I I0 indicates the work supporting.

base ofa sewing machine: embodying my-invene.

tion and Whichcomprises:usualstandarditt, having an overhangingrarm' I'ZL With' axheadill3x at its free end; In the-head l'3iis. journalled :the

usual; reciprocatory' needle' ban l.4= carrying. two.

spaced needl'esdbr The-needle -bar. is reciprozcated by'a lever lii' m'ount'ed on apivotishattilI;

- Alooper H3 is oscillated and cooperates .withthe. twospaced needlest The: looper thread interlocks. with the needle threads: to form stitching. assis well known-"in: the sewing-machine art.a. 'Ihema; terial worked upon: -is -=helddown :by: a presser foottll resting-on a need-le -pl'ate20secured to the Work supporting bas e 1 0i Projecting through the needle plat'e. 2i): iss'a.

lower feed idog 21. The -feededog .21 :is carried by a feed-bar 22 attached; toz'a :fe'ed'- rocker 17231.

Theiced rocker: 23 -is- :oscil1ated:. by an :armw 24 connected in" tl'leusual mannerto. a :pitmandib on the forward end of the main shaft 26'. The feed-bar 2 2' is raised and lowered by an eccentric.

2? on the mainshaft-ZG.

By' actuating a' -screw 28,1 Figure 3,. the.=-crank..- 2 5- is' .causedto vmove to. or .away' fromzthezcenter of the: main shaftIZGIand' causes thelarm 24 to imparta larger or smaller swing to .a' stub shaft;

ES -and feeding movementswto. thecfeedr-dogfl I Thefoot l 9 hassitsxshanlc fioz'secured'jtoa thev lower end of a presser bar 3| which is supported in the head I3 in the usual manner. Pressure is maintained upon the foot I9 by a leaf spring 32 pressing upon the presser-bar 3|.

This invention is particularly directed to a duplex trimming mechanism 33 for trimming two fabric edges so as to prepare a strip of predetermined width. The trimmed strip is fed to a folder 34 for folding the strip into belt loop form and directing the same to the stitching mechanism for stitching the belt loop. The invention also provides a top feed-dog 35 for feeding the strip to and through the trimming mechanism. A top feed-dog 36 is shown for feeding the cut strip to and through the folder and to the stitching machine. The top feed-dogs 35 and 36 are operated in timed relation'with the lower feed-dog 2|. The folder 34 and the top feed-dog 36 are fully disclosed in my said appli-,

cation for belt loop sewing machine, Serial No. 340,577, filed June 14, 1940, Patent No 2,262,547.

The forward top feed-dog 35 feeds the scrap fabric to and through movable shear blades 31, 31 held in carriers 38, 36'. The movable blade carriers are slidably mounted on a rock shaft 39. The carriers 33 are keyed to the shaft 39 by a key 49 and are resiliently pressed by coil springs 4| in the direction of the stationary shear blades 41. The springs 4| react against collars 42 fixedly mounted on the shaft 39. The stationary shear blades 41 are held inproperly spaced cutting relation by being held in a fixed carrier 43 of the desired width. The movable shear blades 31, 31 thus cooperate with the stationary shear blades 41 to cut a fabric strip of predetermined width.

The movable shear blades 31, 31 are given substantially vertical movements by the carriers 38, 33?. The carriers slidably engage the elongated key 40. The key is held in fixed parallel relation with the rock shaft 39 by being slidably held in an arm 44 fixed to the shaft. An arm 45 is fixed to one end of the shaft 39 and is pivotally connected to a ball-joined vibrating connecting rod 46 operated by an arm 44 on a rock shaft 48.

The rock shaft. 48 actuates the connection 46 and the rock shaft 39. The rock shaft 39 actuates the movable shear blades 31, 31' once for each revolution of the main shaft 26. Shaft 48 is rocked by eccentric 49 on shaft 26.

As shown in Figure 4, therrearward top feeddog 36 is elongated and serves for feeding the folded strip of fabricthrough the folder 34 and to the central portion of the'feed-dog 2|. The feed-dog 36 is mounted on a pivot 53 at one end of a top feed bracket 54 and adapted for reciprocating motion in a linear passage 55 in the upper portion of the folder 34. The top feed bracket 54v is mounted on a pivot 56 at the upper end of a feed-bar extension 51 which is raised and lowered by an eccentric. 58 mounted on the main shaft 26 (Figure 5).

3 As. shown in Figures 4 and 5, the top feed-dog 35 for feeding the scrap fabric to the shear blades 31, 31 is pivotally mounted on. a pin 66 passing through the top feed-dog 36. The top feed-dog 35 is positioned for movement between the movable blades 31, 31'. A leaf spring 6| secured at one end by a screw 62 to the feed-dog 35 and in tensioned engagement at its free upper end with the upright front Wall of the top feed-dog 36 serves to press the top feed-dog 35 against the upper surface of stationary blades 41, and in pressure contact with the work. The upper surface of theblade carrier the blade carrier 43 for the 43 is at the level of a raised front extension 63 of the work supporting base l0 (Figure 2).

As shown in Figure 5, the top feed-dog 35 has feeding teeth 64 extending across the entire lower surface thereof. The teeth 64 face in the same direction as the teeth 65 on the top feed-dog 36, and in the same direction as the teeth 66 on the lower feed-dog 2|.

The top feed bracket 54 is normally maintained in a substantially horizontal position by means of a collar fixed to the pivot 56 and having a vertical extension 61 resting against a horizontally adjustable screw 68 in the feed-bar extension 51. The feed-bar extension 51 is carried by a feed-bar 69 attached to the feed rocker 23,

and is caused to move up and down by the ecof the operator.

centric 56 on the main shaft 26.

I'have provided a resilient means for downpressing the top feed-dog 36 into engagement with the folded belt-loop fabric and so that the teeth of the top feed-dog will be adapted for feeding the belt loop fabric through the folder and directly to the needles. This resilient means comprises a tubular guide or housing'secured to the head I3 by a flange 86; As shown in Figure 9, a top feed plunger 81 has a collar 68 on which a coil spring 89 seats and reacts against an adjusting screw 96. The lower end of the plunger 81 is thus adapted to resiliently downpress the bracket 54 and the top feed-dog 36. The contacting portion of'the end 81' houses a roller 9|.

When the sewing machine is in operation, the top feed bracket 54 is actuated up and down by the eccentric 56 and forward and backward by the feed-rocker 23. The attached top feed-dog 36 and the pivotally mounted top' feed-dog 35 thus have 4-motion feeding movements imparted thereto, similar to the 4-motion feeding movements of the feed-dog 2|. The lower feed-dog feeds the folded fabric through the presser-foot :9 by pressure contact with the lower surface of said fabric.

I have provided a knife shield for the fingers The shield comprises two angular arms II6 which are integral with the folder 34 and extend forwardly above and bethe upper cutting position. The overall width of an assembled set of blades and blade carrier 43 may be varied to suit different widths of belt loops. The carrier 43 has been fastened by a screw I24 to an elongated bracket the shaft'39 is mounted.

As shown in Figures 3, 7 andll, the movable shear blades 31, 31' are secured in housings I26, I26, each having elongated arms I21, I21' extending therefrom. Clamping plates I28, I28 are fastened by screws I29, I29 to the housings. As best shown in Figure 11, the stem portions 50 of the movable blades are of trapezoidal crosssection. The housings and the clamping plates have inclined side walls engageable with the inclined side walls of 'the said stems.

The movable blades may, by adjusting the screws I29, I29, be raised or lowered into the .1 desired cutting position in relation to the sta-.

I25 in which tionary blades. The housings I28, I26 have been mounted in pivotal relation with the carriers 33, 38' by screws I30, I30 threaded into the housings and having their body'portions passing freely through clearance apertures in the carriers. It will be noted that the arms I21, I27 have elongated transverse slots I3I serving to receive screws I32 in threaded engagement with the carriers. It is thus possible to adjust the housings I25, I26 and the movable blades 31, 3'! on the carriers 38, 38 in angular relation with the stationary blades 41, 41 and when the screw I32 is tightened by rotation into the carrier 33', the housing I25 is locked to the carrier and this adjustment provides point contact between the blades.

As shown in Figure 1, the bracket I25 is secured by bolts 99 to the baseplate I of the sewing machine. As shown in Figure 7, the fixed blade carrier 43 has a vertically positioned screw IOI threaded therein and resting on the bracket I25. By adjusting the screw IOI', it is possible to raise or lower the blades 41, 41. The screw I24 passes through a vertically elongated aperture I02 in the carrier 43 to permit this vertical adjustment.

As shown in Figures 3 and 6-, it will be seen that when the looper eccentric 43 on the main shaft 25 actuates the looper eccentric fork I35, that the looper rocker vibrating shaft 48 vibrates the arm 44, the Vibrating connection 45, the arm 45, the rock shaft 39 and the movable blades 31, 31'.

As shown in Figure 5, I have provided a pin I 36 vertically adjustable in the feed-dog 35 by means of a screw I31. The pin I36 rests on a horizontal shoulder in the feed-dog 36 and makes it possible to adjust the height of the feed-dog 35 above the base extension 63 according to the thickness of the fabric employed.

Figures 12 and 13 show stationary shear devices I40 made in the form of disk-shaped wheels having circular side faces with sharp bevelled peripheral edges I4I and secured by screws I23 to the fixed carrier 43. The shear wheels I40 are adapted to cooperate with the movable shear blades 31, 31 held in the carriers 38, 38.

Each shear wheel I40 may thus be turned in steps of about one sixteenth of an inch about the screws I23 to bring a very large number of fractions of the cutting edges into the upper cutting position.

Figures 14 to 16 inclusive show modified stationary shear devices or cutting wheels I45 which are adjustable as a unit jointly with an intermediate alining disk I40. The cutting wheels I 45 have circular side faces with sharp bevelled peripheral edges I41 and secured by screws I23 to the annular disk I45. The shear wheels I45 are adapted to cooperate with the movable shear blades 31, 31' held in the carriers 38, 38.

The shear wheels I45 are spaced apart by the annular alining disk I45 which has a pin I48 extending from opposite faces thereof and which is adapted to enter into a through aperture in each of the said cutting wheels I45.

The two shear wheels I45 may thus be turned jointly in steps of about one sixteenth of an inch about the screws I23 to bring a very large number of fractions of the cutting edges into the upper cutting position.

A screw I49 threaded into the upper portion of the carrier 43 is positioned to enter into the central portion of a cylindrical passage I50 in the said carrier, It is to be noted that the thickness of the disk I46 is such as to cause the bevelled side walls of the wheels I 45 to be slightly spaced from bevelled outer edges of the passage I50 and to permit rotation of the joint assembly of the wheels I45 and the disk I45 within said opening unless held fast by the screw I49 pressing against the disk I45. The overall dimension of the assembled stationary blades is greater at the cutting plane or upper level than the overall dimension at the lower level of said blades. This provides a space or clearance below the horizontal cutting edges and provides contact of the movable blades with only the topmost edges of the stationary blades.

In accordance with the patent statutes I have described and illustrated the preferred embodiments of my invention, but it will be understood that Various changes and modifications can be made therein without departing from the spirit of the invention as defined by the appended claims.

I claim:

1. In a trimming mechanism for belt loops of the class described, a horizontally positioned cutting plan wherein the trimming occurs upon, two stationary and two coacting movable blades, a carrier for said stationary blades, screw means for vertical adjustment and support of said carrier and said stationary blades relative to said horizontal cutting plane, a rock shaft mounted below said cutting plane, carriers for said movable blades slidably mounted on said rock shaft and being resiliently pressed by coil springs in the direction of said stationary blades, each of said movable blades being secured in a housing, said housings being pivotal- 1y mounted on said slidable carriers, each of said movable blade housings having an elongated horizontal extension including an arcuate slot, releasable means in said slidable carriers and passing through said slots and adapted to secure said housings to said slidable carriers, said releasable means permitting pivotal adjustment of said movable blades on said slidably mounted carriers to angular positions in relation to said coacting fixed blades, whereby said coacting blades are caused to forcibly contact solely at single successive points, each of said stationary blades having cutting surfaces peripherally disposed about a central pivot, and having means for manually adjusting said cutting surfaces successively into horizontal cutting positions.

2. In a trimming mechanism for belt loops of the character described, a horizontally positioned cutting plane wherein the trimming occurs upon, two stationary and two coacting movable blades, an upright carrier for said stationary blades, said carrier having a vertically elongated aperture, a screw passing through said aperture and adapted for vertical adjustment and support of said carrier and said stationary blades relative to said horizontal cutting plane, a rock shaft mounted below said cutting plane, carriers for said movabl blades slidably mounted on said rock shaft and being resiliently pressed by coil springs in the direction of said stationary blades, each of said movable blades having a stem and being secured in a housing with said stem in vertical position, said housings having releasable cylindrical pivots parallel with said stems and extending freely into cylindrical apertures in said carriers, said housings being pivotally mounted on said slidable carriers solely by rotation about said pivots,

each of said stationary blades having cutting surfaces peripherally disposed about a central pivot, said stationary blade carrier having a horizontally positioned cylindrical aperture at'its upper end, a cylindrical member rotatab y mounted in said aperture; and means for-connecting said cylindrical member and said stationary blades whereby both of saidstationary blades are adjustable as a unit.

JOSEPH GALKIN. 

